package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstont;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponsepVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    private RestHighLevelClient client;
    @Autowired
    ProductFeignService productFeignService;
    @Override
    public SearchResult search(SearchParam param) {
//1.动态构造dsl语句
        SearchResult result = null;

        //1.准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);

        try {

                //2.执行检索请求
                SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
                //3.分析响应数据封装的格式
                result = buildSearchResult(response,param);


        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
//构建结果数据
    private SearchResult buildSearchResult(SearchResponse response ,SearchParam param) {
        SearchResult result = new SearchResult();
        //1.返回所有的查询的商品
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if(hits.getHits()!=null && hits.getHits().length>0){
            for (SearchHit hit : hits) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel sku = JSON.parseObject(sourceAsString,SkuEsModel.class);

                if(!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    sku.setSkuTitle(string);
                }
                esModels.add(sku);
            }
        }
       result.setProducts(esModels);

//        //2.当前所有商品涉及到的属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1.得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            //2.得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();

            //3.得到属性的所有值
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);
            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);

//        //3.当前所有商品涉及到的品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1.得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            //2.得到品牌的名字
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            //3.得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandImg(brandImg);
            brandVo.setBrandName(brandName);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
//        //4.当前所有商品涉及到的分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
       result.setCatalogs(catalogVos);
//        //分页信息、页码
        result.setPageNum(param.getPageNum());
//        result.setPageNum();
//        //分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
//分页信息-总页码-计算
        int totalPages = (int)total%EsConstont.PRODUCT_PAGESIZE == 0?(int)total/EsConstont.PRODUCT_PAGESIZE:(int)(total/EsConstont.PRODUCT_PAGESIZE) +1;
        result.setTotalPages(totalPages);
        List<Integer> pageNavs = new ArrayList<>();
        for(int i =1 ;i<=totalPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);
        //构建面包屑功能
        if(param.getAttrs()!=null && param.getAttrs().size()>0){
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                //1.分析每一个attrs传来的值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.info(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));

                if (r.getCode() == 0) {
                    AttrResponsepVo data = r.getData("attr", new TypeReference<AttrResponsepVo>() {
                    });
                    R brandName = productFeignService.brandName(data.getAttrId());

                    String name = brandName.getData("brandName", new TypeReference<String>() {
                    });
                    navVo.setNavName(name+":");
                }
                    else {
                    R brandName = productFeignService.brandName(Long.parseLong(s[0]));

                    String name = brandName.getData("brandName", new TypeReference<String>() {
                    });
                    navVo.setNavName(name+":");
                }
                //2.取消了这个面包屑以后，我们要跳转到那个地方，将请求地址的url里面的当前置空
                //拿到所有查询条件，去掉当前。
                String replace = replaveQueryString(param, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }

        //品牌，分类
        if(param.getBrandId()!=null&&param.getBrandId().size()>0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌:");
            //todo 远程调用品牌的接口
            R r = productFeignService.brandsInfo(param.getBrandId());
            if(r.getCode()==0){
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace ="";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getName()+";");
                     replace = replaveQueryString(param, brandVo.getBrandId()+"","brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
            }
            navs.add(navVo);

        }
        //todo 分类：不需要导航取消

        return result;
    }

    private String replaveQueryString(SearchParam param, String value,String key) {
        String encode = null;
        try {
             encode = URLEncoder.encode(value, "UTF-8");
            encode = encode.replace("+", "%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&"+key+"="+ encode, "");
    }

    //准备检索请求
    private SearchRequest buildSearchRequest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建dsl语句
        //1.构建bool-query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1构建must
        if(!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //1.2bool-filter-三级分类查询
        if(param.getCatalog3Id()!=null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        //1.2bool-filter-品牌Id查询
        if(param.getBrandId()!=null && param.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        //1.2bool-filter-按照所有指定属性进行查询
        if(param.getAttrs()!=null && param.getAttrs().size()>0){

            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();
                String[] s = attrStr.split("_");
                String attrId = s[0];//检索的属性id
                String[] attrValues = s[1].split(":");//这个属性的检索用的值
                nestedboolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                //每一个都得生产一个nested
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }

        }
        //1.2bool-filter-按照库存进行查询
       Integer stock = param.getHasStock();
        if(stock!=null ) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", stock==1));
        }

        //1.2按照价格区间
        if(!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if(s.length==2){
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length==1){
                if(param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if(param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        //所有的条件进行封装
        sourceBuilder.query(boolQuery);

        //排序，分页，高亮
        //2.1排序
        if(!StringUtils.isEmpty(param.getSort())){
            String sort = param.getSort();
            String[] s = sort.split("_");
          SortOrder order =  s[1].equalsIgnoreCase("asc")? SortOrder.ASC:SortOrder.DESC;
          sourceBuilder.sort(s[0],order);
        }
        //2.2分页 pageSize:s pageNum :1 form 0 size 5
        sourceBuilder.from((param.getPageNum()-1)*EsConstont.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstont.PRODUCT_PAGESIZE);
        //2.3高亮
        if(!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }
        //聚合分析
        //1.品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //品牌聚合的子品牌
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);
        //3.属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");

        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);
        String s = sourceBuilder.toString();
        System.out.println("构建的DSL:"+s);
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstont.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;
    }
}
